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Korean Society of Life Science (한국생명과학회)
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Induction of Rice Allergen-Specific IgE Synthesis by KU8l2 Cells

KU812세포에 의한 쌀 알레르겐 특이적 IgE항체 합성의 유도

  • Shim, Sun-Yup (Oriental Medicine Research & Development Institute, Pukyong National University) ;
  • Katakura, Yoshinori (Department of Genetic Resources Technology, Faculty of Agriculture, Kyushu University) ;
  • Shirahata, Sanetaka (Department of Genetic Resources Technology, Faculty of Agriculture, Kyushu University)
  • Published : 2007.11.30
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Abstract

In vitro IgE class switching could be induced through co-culture of CD40L-expressing KU812 cells and CD40-expressing B cells in the presence of IL-4 or IL-13. It has been generated several B cell lines, which produce rice allergen (RA)-specific IgM antibody by in witγo immunization (IVI) using peripheral blood lymphocyte (PBL). In this study, induction of RA-specific IgE antibody by KU812 cells was attempted. Before co-culture, we determined the CD40 expression in RA-specific B cell lines, RA9G11 and the CD40 ligand (CD40L) expression in activated KU812 cells by treatments with phorbol myristate acetate (PMA) and ionomycin for 6 hrs. Flow cytometric analysis shown that RA9G11 and activated KU812 cells expressed high level of CD40 and CD40L, respectively. RA9G11 cells were cultured with activated KU812 cells for 12 days in the presence of IL-4 for IgE class switching. Mature $C{\varepsilon}$ mRNA level and RA-specific IgE spot forming cells (SFC) were observed in all culture condition, and especially, high level of RA-specific IgE synthesis was determined the same ratio of RA9G11 and activated KU812 cells in the presence of 50U IL-4. Therefore, induction of RA-specific IgE synthesis by activated KU812 cells can be contributed in the application for allergic therapy and prevention.

CD40L를 발현하는 KU812세포와 CD40를 발현하는 항원 특이적 B 세포의 배양을 통해 IgE 클라스 스위치가 유도된다. 본 연구자는 체외면역법에 의해 건강인의 말초혈액을 이용하여 쌀 알레르겐 특이적 IgM 항체를 생성하는 B 세포주를 수립하였다. 본 연구에서는 KU812세포에 의한 쌀 알레르겐 특이적 IgE 항체의 유도를 시도하였다. 배양 전, 쌀 알레르겐 특이적 B 세포주, RA9G11과 PMA와 ionomycin을 6시간 처리하여 활성화된 KU812세포에서 CD40와 CD40L 발현량을 flow cytomerty를 통화여 각각 확인하였다. RA9G11세포와 활성화된 KU812세포는 높은 수준의 CD40와 CD40L를 각각 발현하였다. 쌀 알레르겐 특이적 IgE항체 합성 유도를 위해, 여러 가지 농도의 IL-4 존재하에, RA9G11세포와 활성화된 KU812세포를 12일 동안 배양하였다. IgE 정상영역의 mRNA 발현량과, 쌀 알레르겐 특이적 IgE 항체 생성 세포가 모든 조건에서 확인되었으며, 특히 50U의 L-4 농도 하에서 같은 비율의 RA9G11과 활성화된 KU812세포를 배양했을 때, IgE 합성이 가장 높았다. 따라서 활성화된 KU812세포에 의한 쌀 알레르겐 특이적 IgE 합성은 알레르기 질환의 치료 및 예방에 관한 연구에 기여할 것으로 사료된다.

Keywords

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